(Black) shirt sleeve length with a (black) jacket (and jeans)?

Well, we all know about the sleeve-length-rule for shirts under a suit, but what do you do when it comes to simply wearing a jacket over a shirt casual style? I'm not referring to the classic blue-shirt-with-a-tie-under-a-charcoal-jacket-with-classy-trousers which makes an almost-suit, but, yes I admit, the Hank-Moody-style, which usually involves dark blue jeans, a black shirt and a black blazer.